PDF malware analysis — malicious · a10778b20be68a8d

MALICIOUS

PDF

83.1 KB Created: 2021-08-03 02:04:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07

MD5: b82a73a9b5329a4085c4032e4d81f395 SHA-1: bf8f88ab4cdec4ca88b65660aacca71074336d9b SHA-256: a10778b20be68a8d332fdcdfb2c657c3a79e286c78df5b6b327ef21c9e0a45e4

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains numerous embedded URLs, many pointing to compromised websites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The document body is heavily obfuscated and unreadable, providing no direct user-facing lure.

Machine Learning

Nyx PDF Classifier malicious score 0.9974

Heuristics 6

ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM

PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM

Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
External URI info PDF_URI

PDF contains an external URL action
Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL

The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
Embedded URL info EMBEDDED_URL

One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
URL https://ketchas.ru/uplcv?utm_term=fluid+mechanics+fundamentals+and+applications+2nd+edition+solutions PDF link annotation
- http://www.gaviprintpack.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088b09a9a7b0---50008449713.pdfIn PDF document text
- http://ankurgroups.com/userfiles/file/fumadox.pdfIn PDF document text
- https://andrejc.si/files/file/77038168683.pdfIn PDF document text
- http://weilandensemble.nl/ckfinder/userfiles/files/rufubutubuvajuketotogej.pdfIn PDF document text
- https://boldvision.tv/wp-content/plugins/formcraft/file-upload/server/content/files/16092c71536967---jamapibugipikebateb.pdfIn PDF document text
- https://senfina.top/uploads/files/gasegidixop.pdfIn PDF document text
- http://d4sontario.ca/clients/e/ed/ed023a0734c265ca673a92d1d81de675/File/23782405393.pdfIn PDF document text
- http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086224548e55---vugedebazizobasirogaluva.pdfIn PDF document text
- http://obchodsezlatem.cz/upload/files/xesapumutozitisekogadibe.pdfIn PDF document text
- https://clickkedai.com/userfiles/file/83047107988.pdfIn PDF document text
- https://apskarota.org/userfiles/file/58349982477.pdfIn PDF document text
- https://expungemyrecordnj.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b523ef8383b---20361820033.pdfIn PDF document text
- https://grupo-bahia-real-estate.com/ckfinder/userfiles/files/76222055755.pdfIn PDF document text
- https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/2c1f69905ab82f4634b4b73765d8607f/33787897159.pdfIn PDF document text
- http://www.thediethub.in/wp-content/plugins/formcraft/file-upload/server/content/files/160de121f069d4---zubekisibiwadesasirufige.pdfIn PDF document text
- https://qamarapps.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9ced18d078---74777966157.pdfIn PDF document text
- http://kystop.com/wp-content/plugins/super-forms/uploads/php/files/eb1v6d05ncpcr1813vm3gasmq5/zawavogemaxapowam.pdfIn PDF document text
- http://www.iamgoingto1996.com/wp-content/plugins/formcraft/file-upload/server/content/files/160946e576cdf7---tujozoteza.pdfIn PDF document text
- http://xn--h49al33a2zdp0eo1x.com/DATA/file/20210626193600.pdfIn PDF document text
- http://www.franklinwebdesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2ac5355581---12205659970.pdfIn PDF document text
- http://koreanhotpot.com/uploads/files/nazevilaxoto.pdfIn PDF document text
- http://actionelectric.pt/www/wp-content/plugins/formcraft/file-upload/server/content/files/160ade493daebd---kolurisazulexilebuvex.pdfIn PDF document text
- http://ebanksunited.com/clients/7/7d/7da19d52c1086e69e61582739ce98a0f/File/56656856908.pdfIn PDF document text
- http://artospace.com/pics/file/74864117775.pdfIn PDF document text
- https://nhakhoaanphuoc.vn/uploads/files/napaxuzexigiposigul.pdfIn PDF document text
- http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
- http://purl.org/dc/elements/1.1/In PDF document text
- http://ns.adobe.com/pdf/1.3/In PDF document text
- http://ns.adobe.com/xap/1.0/In PDF document text
- http://ns.adobe.com/xap/1.0/mm/In PDF document text
- http://ns.adobe.com/xap/1.0/rights/In PDF document text
- http://dejavu.sourceforge.netIn PDF document text
- http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`font_00_sfnt_off0000df70.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xDF70	16684 bytes
SHA-256: `87e157586c76e52d24698072aed2f6d527b91fbe02a071c4450312372ae80ace`
`font_01_sfnt_off00010a82.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10A82	10980 bytes
SHA-256: `bbac9978637715aaf224545f1774f17811f17aefee1c0433ade8ebc3d6437c6b`
`font_02_sfnt_off000123ce.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x123CE	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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